Vibrating screen



wwsa

Nov. 9 1926.

H. CLARK VIBRATING SCREEN Filed Oct. 17

Patented 9, 192 3.

UNITED STATES PATENT OFFICE.

HENRY CLARK, OF WESTMINSTER, LONDON, ENGLAND, ASSIGNOR OF ONE-HALF TO HEAD WRIGH'ISON & COMPANY, LIMITED, OF THOENABY-ON-TEES, ENGLAND.

VIBRATING- SCREEN.

Application filed October 17, 1925, Serial No.

This invention relates to horizontal or inclined vibrating screensfor use in separating minerals or other granular materials. Such apparatus may also be usefully employed for dewatering materials.

According to this invention I fit either above or below the surface of the screen a cylinder having a piston and a valve with pressure and exhaust ports so arranged that when compressed air is admitted to the cylinder the piston is reciprocated in the cylinder, and the piston or a piston rod imparts a succession of rapid vibrations to the screening surface or to the frame carrying the same. The cylinder has preferably a short stroke and a small bore.

Preferably the cylinder is cooled by the air, which, due to expansion, is greatly re duced in temperature.

Instead of the compressed air cylinder a small cylinder in which the piston is actuated by steam, gas, oil or spirit, may be employed. The cylinder may in all cases be cooled by means of air or water circulating in a jacket surrounding the cylinder.

In the accompanying drawing which illustrates the invention, Figure 1 is a sectional side elevation, Figure 2 a sectional end'elevation and Figure 3 a part sectional plan. Figure 4 is a detail view to a larger scale.

1 is a frame pivoted at 2 at any convenient fixed point and 3 is a bolt for adjusting the inclination of the frame 1. 4 is a fixed transverse T bar upon'the flanges of which rest the adjacent ends of cover plates 5. Secured to the frame 1 are plates 6 to which a screening surface 7 is clamped, its tension being capable of adjustment by means of rods 8 engaging fixed nuts 9. 10 is a longitudinal bar to which is secured a T block 11, and 12 is a nut and bolt which secures a cap 13 screwed upon one end of a casing 14, the other end of which is provided with a cap 15 which enters a recess in a flanged plate 16 secured to the bar 4:. 17 is the piston of a compressed air motor (see Figure 4) which slides in a cylinder 18 provided with end caps 19, 20, having spiral fins 21. 22 is a spring which returns the piston 17 to the upper end of the cylinder 18 (i. e. to

63,026, and in Great Britain March 20, 1925.

its out-position) when the motor is not in use. 23 is an inlet passage in the cylinder 18, the said passage leading to ports 24, 25. whilst 26, 27 are transverse passages in the piston 17, and 28, 29 are passages leading from the passages 26, 27 to the cylinder ends. 30, 31 are exhaust passages in the cylinder 18. 32 are oil pads.

In operation when compressed air is admitted to the cylinder 18 the piston 17 is rapidly reciprocated and imparts a vibration to the screening surface 7.

The exhaust passages 30, 31 are so arranged that the exhaust air, which, due to expansion, is greatly reduced in tempera ture, is projected tangentially against the side of the casing 14, thus creating a swirl of air which, striking against the spiral fins 21 at both ends of the cylinder, absorbs the heat generated by the piston striking the steel disks, the heated air escaping through the top and bottom of the casing 14.

If it be desired to remove the motor from the screening surface 7, this can be effected by withdrawing the bolt 12 and removing the cap 15 from the recess in the plate 16.

It will be observed that the fluid actuated reciprocating engine is mounted on the bar in a plane at right angles to the screening surface.

What I claim is 1. In apparatus for treating granular material, a screen having a screening surface, a bar secured to the screening surface, and a fluid actuated reciprocating engine mounted on and supported by the bar in a plane at right angles to the screening surface.

2. In apparatus for treating granular material, a screen having a screening surface, a bar secured to the screening surface, a cylinder mounted on and supported by the bar in a plane at right angles to the screening surface, a piston in the cylinder, and fluid means for actuating the piston.

3. In apparatus for treating granular material, a screen having a screening surface, a bar secured directly to the screening surface, and a fluid actuated reciprocating engine mounted directly on and supported by said bar in a plane at right angles to the surface of the screen.

' 4. In apparatus for treating granular inateriai, a screen having a screening surface, a bar secured to the screening surface, a

fixed bar a flanged plate secured to the fixed.

bar, a eylinder, a casing surrounding the cylinder, one end benig secured to the bar on the screen and the other enterlng the reoess formed by the flanged plate, apiston in the cylinder, and fluid means for actuating the piston.

In testimony that 1 claim the foregoing us my invention I here signed by name this 23rd day of September, 1-925.

HENRY CLARK. 

